I claim the ornamental design for the helmet skin or coverings, as shown and described in the drawings, and helmet skins or coverings having a similar aesthetic appearance.
FIG. 1 is a top, front, left-side perspective view of the helmet skin of the present invention.
FIG. 2 is a bottom, rear, right-side perspective view of the helmet skin shown in FIG. 1;
FIG. 3 is a top perspective view of the helmet skin of FIGS. 1-2;
FIG. 4 is a left-side perspective view of the helmet skin shown in FIGS. 1-2;
FIG. 5 is a bottom perspective view of the skin shown in FIGS. 1-2; and,
FIGS. 6 and 7 are front and rear perspective views of the skin shown in FIGS. 1-2.
The broken lines shown on the drawings form no part of the claimed design.